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hungreo14022002
2 năm trước
the concert..........................(start) at 7 p.m ...................................(she-visit) her grandma very often? sandra.......................(lend) her brother $200 so far My parents .......................(go) to the theater yesterday evening we ............................. ( go /not) to school on sundays mary.................... (lose) her hat for 2 days
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Air pollution occurs when wastes dirty the air. People produce most of the wastes that cause air pollution. Such wastes can be in the form of gases or particles of solid or liquid matter. These substances result chiefly from burning fuel to power motor vehicles and to heat buildings. Industrial processes and the burning of garbage also contribute to air pollution. Besides, there are other polluting substances that exist naturally into the air. They include dust, soil particles, and naturally occuring gases. The rapid growth of population, industry and the increasing use of automobiles and airplanes have made air pollution a serious problem. The air we breathe has become so filled with pollutants that it can cause health problems. It also harms plants, animals, building materials, and fabrics. 13. All of the wastes that people produce cause air pollution. 14. Soil participles are natural pollutants. 15. Polluted air has a harmful influence on people, plants and animals. 16. Air pollution has become a serious problem due to the increasing population and industry. 17. The word “they” in line 5 refers to: A. motor vehicles B. natural pollutants C. Industrial processes D. buildings 18. What does not contribute to air pollution? A. The burning of garbage B. industrial processes C. motor vehicles D. the natural existence of oxygen in the air

check giùm 1) I........................ (look) for Lucy.Do you know where she is? 2) Dan .........................(play) games in the living room while we ..............(decorate) his bedroom 3) Luna,is it true that you ........................... (get) married next week? 4) My sister has bought some apples.She..............(make) some apples pies. 5) I didn't drink coffee because I ...................(drink) a cup of coffee aldready 6) I'm going on the trip to Nha Trang on saturday.This time tomorrow,I............. (eat) many kinds of tasty seafood. 7) When the robbery ........................ (happen),the security guard ...................(sleep) 8) Last summer, I ..................(go) the beach almost everyday 9) By the end of next mounth,we ..............................(join) this English club for 2 years

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